Quantum-limited measurement of spin qubits via curvature coupling to a cavity

Abstract

We investigate coupling an encoded spin qubit to a microwave resonator via qubit energy level curvature versus gate voltage. This approach enables quantum non-demolition readout with strength of tens to hundred MHz all while the qubit stays at its full sweet-spot to charge noise, with zero dipole moment. A "dispersive-like" spin readout approach similar to circuit-QED but avoiding the Purcell effect is proposed. With the addition of gate voltage modulation, selective longitudinal readout and n-qubit entanglement-by-measurement are possible.

5 pages, 1 figure

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• Unifying Floquet theory of longitudinal and dispersive readout
• Ultra-dispersive resonator readout of a quantum-dot qubit using longitudinal coupling
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• Kinetic inductance coupling for circuit QED with spins